Relationship building? That's all? Whatever. Wow. Way to not read the whole post. I applaud you. As I said, I think that is the toughest part. I never said that is the only part. Outside of that, most of it is probably very similar to normal business management. To be a GM, you have to be able to manage different facets of the business: scouting, player developement, coaching, accounting (despite what is said by those who think baseball teams don't have a budget), media/public relations, etc. Obviously, GMs have people working for them that head-up those different areas, but the GMs have to manage the whole process.